CVE-2024-52510: 
Nextcloud Desktop Client vulnerability analysis and mitigation

The Nextcloud Desktop Client, a tool for synchronizing files between Nextcloud Server and local computers, was found to contain a security vulnerability (CVE-2024-52510) where the client failed to properly handle signature validation. Specifically, the client would continue operation without raising an error when receiving an empty initial signature from a manipulated server, effectively bypassing the signature validation mechanism (GHSA Advisory).

The vulnerability is classified as CWE-295 (Improper Certificate Validation) and has been assigned a CVSS v3.1 base score of 4.2 (MEDIUM) with the vector string CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N. This indicates that while the vulnerability requires network access, it has high attack complexity and requires both high privileges and user interaction to exploit. The vulnerability affects all versions of the Nextcloud Desktop Client from version 3.0.0 until the patched version (GHSA Advisory).

When successfully exploited, the vulnerability could allow an attacker to bypass signature validation mechanisms, potentially compromising the confidentiality of data by circumventing encryption protections. The CVSS scoring indicates high impact on confidentiality but no direct impact on integrity or availability (GHSA Advisory).

The vulnerability has been patched in Nextcloud Desktop Client version 3.14.2. Users are strongly recommended to upgrade to this version or later as no alternative workarounds are available (GHSA Advisory).